CN102776319B - Electrical control system and method for preventing converter slippage - Google Patents
Electrical control system and method for preventing converter slippage Download PDFInfo
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- CN102776319B CN102776319B CN201210295076.2A CN201210295076A CN102776319B CN 102776319 B CN102776319 B CN 102776319B CN 201210295076 A CN201210295076 A CN 201210295076A CN 102776319 B CN102776319 B CN 102776319B
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Abstract
The invention provides an electrical control method for preventing converter slippage. The electrical control method comprises the following steps of: calculating tilting angular acceleration of a converter according to an obtained tilting angle of the converter; then, judging whether the converter is subjected to the converter slippage phenomenon or not according to the tilting angular acceleration of the converter; and finally, controlling a converter tilting motor according to the judgment result. A band-brake electrical system of the tilting motor adopts an electrical design method that an incoming-line power supply is connected with double contactors and double breakers, thereby effectively avoiding accidents caused by non-mechanical brake due to the adhered contactors. The angular acceleration is calculated according to tilting angle variation, and whether the converter has the converter slippage phenomenon or not is judged according to the angular acceleration; and moreover, the tilting angle variation tendency is compared with the converter operation direction defined by a converter rocking handle to judge whether the movement direction of the converter is consistent with the operation direction of the converter rocking handle or not, so that the converter slippage accident caused by inconsistent operation and practical directions is prevented.
Description
Technical field
The invention belongs to the converter steelmaking field in smelting iron and steel, the secured electrical that is specifically related to a kind of converter inclining is controlled Controlling System and method.
Background technology
In large-scale iron and steel industry, adopt converter steelmaking process in occupation of the main status of process for making.Converter tilting system is the core steelmaking equipment of converter steelmaking, integrated alternating-current electric transmission and mechanical gear transport characteristics; Due to the singularity of operating mode, require this equipment evenly adjustable at operational process medium velocity, and can realize quick acceleration; The characteristics such as system characteristic is hard, is subject to the impact of load variations little, and staring torque is large, fast response time, can realize quick and precisely and stopping, and equipment failure rate is low; And must possess high reliability and security.
Converter tilting system, is to adopt alternating-current actuating system now mostly, is set to 4 tilting motor and drives converter to rotatablely move by mechanical gear.Because converter environment is high temperature, hyperbaric environment, dangerous large, particularly dangerous maximum when tapping, control bad easy body of heater overthrow accident, cause equipment and personnel's serious accident.Therefore whether converter tilting system is considered to put in place in safety performance, and minimizing accident is had to important effect.
Summary of the invention
In view of this, technical problem to be solved by this invention is to provide and a kind ofly prevents that converter from slipping electric control system and the method for stove.
One of object of the present invention is to propose a kind of anti-converter to slip the electric control system of stove; Two of object of the present invention is to propose a kind of anti-converter to slip the electric control method of stove.
One of object of the present invention is achieved through the following technical solutions:
The electric control system of stove is slipped in anti-converter provided by the invention, comprises converter inclining motor, also comprises angle acquisition device, data handler, frequency-variable controller, the first contactor, the second contactor, the first isolating switch and tilting motor stopper;
Described the first contactor is connected with converter inclining electromotor brake with after the second contactor serial connection, and described the first isolating switch is electrically connected to the first contactor, for controlling the on off state of the first contactor; Described angle acquisition device is used for gathering converter inclining angle information; Described converter inclining angle information is input in data handler to be processed; Described data handler is connected with frequency-variable controller, and described frequency-variable controller is connected with converter inclining motor.
Further, described angle acquisition device is turning angle encoder; Described the first isolating switch is the isolating switch of two interlocks, and an isolating switch is connected with external impetus power supply, and another isolating switch is connected with standby ups power.
Further, the acceleration that described data handler changes according to converter inclining angle information Real-time Obtaining turning angle, and by the acceleration of relatively turning angle variation and the magnitude relationship of predetermined threshold value, judge whether converter inclining motor needs to quit work.
Further, described data handler basis is by judging whether to stop converter working process to the direction of operating relation of the variation of converter inclining angle and converter grate handle, if converter inclining direction and converter direction of operating, when inconsistent, stop the work of converter inclining motor.
Two of object of the present invention is achieved through the following technical solutions:
The electric control method of stove is slipped in anti-converter provided by the invention, comprises the following steps:
S1: obtain converter inclining angle;
S2: the angular aceeleration that calculates converter inclining by converter inclining angle;
S3: the angular aceeleration by converter inclining judges that whether converter occurs slipping stove phenomenon, if not, returns to step S1;
S4: if, make frequency transformer in zero-speed state, make converter motor in band-type brake state.
Further, in described step S3, occurring slipping stove phenomenon is undertaken by following steps:
S21: whether the angular aceeleration that judges converter inclining surpasses preset value, if not, does not occur slipping stove phenomenon;
S22: if there is slipping stove phenomenon.
Further, in described step S3, occurring slipping stove phenomenon is undertaken by following steps:
S31: obtain the lever operated direction of grate;
S32: the change direction of obtaining converter inclining angle by the angle of converter inclining;
S33: judge that whether the lever operated direction of grate is consistent with the change direction of converter inclining angle, if so, do not occur slipping stove phenomenon;
S34: if not, occur slipping stove phenomenon.
Further, described converter inclining angle is obtained by turning angle encoder.
Further, the angular aceeleration of described converter inclining calculates by following formula:
a＝|θ
k+1-θ
k|，
Wherein, a represents the angular aceeleration of converter inclining, θ
krepresent the converter inclining angle of K during second, θ
k+1represent the converter inclining angle of k+1 during second, k is k moment second;
Further, in described step S4, make converter motor comprise the following steps in band-type brake state:
S41: time delay 1s-2s after frequency transformer sends zero-speed instruction;
S42: send instruction to mechanical hatching gate device, realize mechanical hatching gate.
Further, whether the change direction of the lever operated direction of described grate and converter inclining angle is consistent is undertaken by following steps:
S331: the turning angle value that keeps current converter;
S332: grate handle operates converter inclining, obtain the lever operated direction of grate and grate handle to converter inclining speed;
S333: be recorded in grate when lever operated, the conversion of converter inclining angle;
S334: if grate handle to flushing and casting, converter inclining angle should become greatly, if angle diminishes, direction is inconsistent;
S335: if grate handle operates after stove, converter inclining angle should diminish, if angle becomes greatly, direction is inconsistent.
The invention has the advantages that: the present invention adopts by converter inclining angle is changed to calculate its angular aceeleration, according to angular aceeleration, differentiate converter and whether exist and slip stove; And compare by the change trend of turning angle and the converter direction of operating of giving of grate handle, thereby judge the direction of movement converter and whether the direction of operating of grate handle is consistent, prevent the stove accident of slipping that operation and actual direction are inconsistent brought, guarantee the security of converter operation.
The invention provides and prevent that converter from slipping the tilting motor source brake control system of stove and adopting incoming power to connect the structure of two contactors and dual-breaker, effectively avoided because a contactor is long conduction time, and occur bonding, can not power-off make the malfunctioning and accident that occurs of converter band-type brake, improved electrical security and the reliability of converter band-type brake system.
Described in above comprehensive, the present invention has greatly improved the safety and stability of converter inclining.There is important economic worth and social value.
Other advantage of the present invention, target and feature will be set forth to a certain extent in the following description, and to a certain extent, based on will be apparent to those skilled in the art to investigating below, or can be instructed from the practice of the present invention.The objects and other advantages of the present invention can be by below specification sheets and accompanying drawing in specifically noted structure realize and obtain.
Accompanying drawing explanation
In order to make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, the present invention is described in further detail, wherein:
Fig. 1 is the electrical design figure of band-type brake;
Fig. 2 is band-type brake system electrical functional block diagram;
Fig. 3 is anti-slip stove control flow chart;
Fig. 4 is that converter direction of operating and actual direction are differentiated schema.
In figure, 1 represents that the first isolating switch, 2 expression the first contactors, 3 represent that the second contactors, 4 represent that tilting motor one stopper isolating switchs, 5 expression tilting motor two stopper isolating switchs, 6 represent that tilting motor three stopper isolating switchs 7 expression tilting motor four stopper isolating switchs 8 represent that frequency transformers output band-type brakes are opened switch, 9 expression PLC output band-type brakes controls, 10 represent tight guard's valve.
Embodiment
Below with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail; Should be appreciated that preferred embodiment is only for the present invention is described, rather than in order to limit the scope of the invention.
Fig. 1 is the electrical design figure of band-type brake, Fig. 2 is band-type brake system electrical functional block diagram, as shown in the figure: the electric control system of stove is slipped in anti-converter provided by the invention, comprises converter inclining motor, angle acquisition device, data handler, frequency-variable controller, tilting motor stopper, the first contactor 2, the second contactor 3 and the first isolating switch 1;
Described the first contactor is connected with converter inclining electromotor brake with after the second contactor serial connection, and described the first isolating switch is electrically connected to the first contactor, for controlling the on off state of the first contactor; Described angle acquisition device is used for gathering converter inclining angle information; Described converter inclining angle information is input in data handler to be processed; Described data handler is connected with frequency-variable controller, and described frequency-variable controller is connected with converter inclining motor.Described angle acquisition device is turning angle encoder.Described converter inclining band-type brake system is two-way Power supply, and an isolating switch is connected with external impetus power supply, and another isolating switch is connected with standby ups power.
Embodiment provided by the invention as shown in Figure 1; tilting motor one stopper isolating switch 4, tilting motor two stopper isolating switchs 5, tilting motor three stopper isolating switchs 6, tilting motor four stopper isolating switchs 7; and the isolating switch of controlling corresponding tilting motor stopper, the electric device that the isolating switch of four tilting motor stoppers is used during as the protection of stopper motor and stopper maintenance.Under normal circumstances, converter band-type brake tilting system, by external impetus Power supply, when externally electrical source of power goes wrong, is switched to ups power power supply.During normal operation, 1～No. 4 electromotor brake isolating switch that fascinates is in closure state, and tilting motor band-type brake system is controlled by the first contactor and the second contactor.In this design, tight guard's valve 10 is to be directly linked in the control loop of band-type brake system with normally closed point, in the situation that occurring that converter is out of control, operator take tightly stopping above operator's console, can directly make the contactor power-off of band-type brake electric loop and converter is stopped by mechanical hatching gate power.
Tilting motor band-type brake control loop controls 9 by frequency transformer output band-type brake switch 8 and PLC output band-type brake, when opening a sluice gate, frequency transformer output band-type brake switch is closed, and PLC output band-type brake control command, without emergent stopping in the situation that, the relief relay of the first and second contactors obtains electric, the first contactor and the second contactor adhesive, and band-type brake is opened; When an order in control loop does not meet, the relief relay dead electricity of the first and second contactors, the first contactor and the second contactor disconnect, and band-type brake is closed.
In the present embodiment there is slipping stove phenomenon and refer to converter tipping accident in converter.Adopted the control mode of two contactors and double relay, improved the stability of the electrical control of band-type brake system, Fig. 1 is shown in the band-type brake system electrical design of safety.When needs band-type brake, by isolating switch, come control contactor to disconnect, what the first contactor, the second contactor adopted is the contactor of different model, can avoid like this causing slipping the accident of stove and occurring because bonding can not disconnection occurs a contactor.
Wherein, in data handler, by angle acquisition device, be used for gathering converter inclining angle information, the acceleration that real-time judgment turning angle changes, calculating formula is: a=| θ
k+1-θ
k| k be k second constantly, by acceleration that relatively turning angle changes and the magnitude relationship of predetermined threshold value, if i.e. a > λ, λ is angular aceeleration predetermined threshold value, is tentatively set to 6; Judge that converter has had sliding stove trend; In the situation that distinguishing that stove danger is slipped in converter existence, send zero-speed instruction at once the frequency-variable controller that fascinates, extend 1.5s simultaneously, send band-type brake instruction at once tilting motor stopper, disconnect two contactors of breaking system, realize mechanical hatching gate.
Data handler in the embodiment of the present invention also provides a kind of basis by the direction of operating relation of the variation of converter inclining angle and converter grate handle is judged whether to stop converter working process, if converter inclining direction and converter direction of operating are when inconsistent, take safety measures, guarantee the security of operation.
First the turning angle value that keeps current converter; Then grate handle operates converter inclining, obtain the lever operated direction of grate and grate handle to converter inclining speed; Be recorded in grate when lever operated, the conversion of converter inclining angle; According to following rule, judge whether stop converter working process:
If grate handle is to flushing and casting, converter inclining angle should become greatly, if angle diminishes, poor direction is true; If grate handle operates after stove, converter inclining angle should diminish, if angle becomes greatly, poor direction is true;
Finally judge converter inclining poor direction true, take safety measures, stop converter.
Fig. 3 is anti-slip stove control flow chart, and Fig. 4 is that converter direction of operating and actual direction are differentiated schema, as shown in the figure: the electric control method of stove is slipped in the anti-converter that the embodiment of the present invention provides, and comprises the following steps:
S1: obtain converter inclining angle;
S2: the angular aceeleration that calculates converter inclining by converter inclining angle;
S3: the angular aceeleration by converter inclining judges that whether converter occurs slipping stove phenomenon, if not, returns to step S1;
S4: if, make frequency transformer in zero-speed state, make converter motor in band-type brake state.
The stove phenomenon that occurs slipping in described step S3 is undertaken by following steps:
S21: whether the angular aceeleration that judges converter inclining surpasses preset value λ, if not, does not occur slipping stove phenomenon; λ is the fixing threshold value of angular aceeleration;
S22: if there is slipping stove phenomenon.
The stove phenomenon that occurs slipping in described step S3 is undertaken by following steps:
S31: obtain the lever operated direction of grate;
S32: the change direction of obtaining converter inclining angle by the angle of converter inclining;
S33: judge that whether the lever operated direction of grate is consistent with the change direction of converter inclining angle, if so, do not occur slipping stove phenomenon;
S34: if not, occur slipping stove phenomenon.
Described converter inclining angle is obtained by turning angle encoder.
The angular aceeleration of described converter inclining calculates by following formula:
a＝|θ
k+1-θ
k|，
Wherein, a represents the angular aceeleration of converter inclining, θ
krepresent the converter inclining angle of K during second, θ
k+1represent the converter inclining angle of k+1 during second, k is k moment second;
In described step S4, make converter motor comprise the following steps in band-type brake state:
S41: time delay 1s-2s after frequency transformer sends zero-speed instruction; In time expand the present embodiment, get 1.5s;
S42: send instruction to mechanical hatching gate device, disconnect two contactors of breaking system, realize mechanical hatching gate.
Whether the change direction of the lever operated direction of described grate and converter inclining angle is consistent is undertaken by following steps:
S331: the turning angle value that keeps current converter;
S332: grate handle operates converter inclining, obtain the lever operated direction of grate and grate handle to converter inclining speed;
S333: be recorded in grate when lever operated, the conversion of converter inclining angle;
S334: if grate handle to flushing and casting, converter inclining angle should become greatly, if angle diminishes, direction is inconsistent;
S335: if grate handle operates after stove, converter inclining angle should diminish, if angle becomes greatly, direction is inconsistent.
Also can define handle to flushing and casting for just, handle is negative to being operating as after stove; By detecting positive and negative that converter inclining angular encoder changes, thereby whether decision operation is consistent with reality, and consistent in the situation that, converter inclining can normal running, if when direction is inconsistent, converter inclining stops at once.
The positive and negative judgement by following formula of converter inclining angular encoder variation:
B=θ
k+1-θ
kif b>=0, is just changed to, if instead b < 0 is changed to negative.
The inconsistent while of change direction that the angular aceeleration of converter inclining can also be surpassed to preset value λ and the lever operated direction of grate and converter inclining angle is as judging whether converter can slip the condition of stove phenomenon, if simultaneously satisfied, slips stove phenomenon.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.
Claims (8)
1. the electric control system of stove is slipped in anti-converter, comprises converter inclining motor, it is characterized in that: also comprise angle acquisition device, data handler, frequency-variable controller, the first contactor, the second contactor, the first isolating switch and tilting motor stopper;
Described the first contactor is connected with converter inclining electromotor brake with after the second contactor serial connection, and described the first isolating switch is electrically connected to the first contactor, for controlling the on off state of the first contactor; Described angle acquisition device is used for gathering converter inclining angle information; Described converter inclining angle information is input in data handler to be processed; Described data handler is connected with frequency-variable controller, and described frequency-variable controller is connected with converter inclining motor;
Described angle acquisition device is turning angle encoder; Described the first isolating switch is the isolating switch of two interlocks, and an isolating switch is connected with external impetus power supply, and another isolating switch is connected with standby ups power.
2. the electric control system of stove is slipped in anti-converter according to claim 1, it is characterized in that: the acceleration that described data handler changes according to converter inclining angle information Real-time Obtaining turning angle, and by the acceleration of relatively turning angle variation and the magnitude relationship of predetermined threshold value, judge whether converter inclining motor needs to quit work.
3. the electric control system of stove is slipped in anti-converter according to claim 1, it is characterized in that: described data handler basis is by judging whether to stop converter working process to the direction of operating relation of the variation of converter inclining angle and converter grate handle, if converter inclining direction and converter direction of operating, when inconsistent, stop the work of converter inclining motor.
4. anti-converter according to claim 1 is slipped anti-converter that the electric control system of stove realizes and is slipped the electric control method of stove, it is characterized in that: comprise the following steps:
S1: obtain converter inclining angle;
S2: the angular aceeleration that calculates converter inclining by converter inclining angle;
S3: the angular aceeleration by converter inclining judges that whether converter occurs slipping stove phenomenon, if not, returns to step S1;
S4: if, make frequency transformer in zero-speed state, make converter inclining motor in band-type brake state;
The stove phenomenon that occurs slipping in described step S3 is undertaken by following steps:
S21: whether the angular aceeleration that judges converter inclining surpasses preset value, if not, does not occur slipping stove phenomenon;
S22: if there is slipping stove phenomenon.
5. the electric control method of stove is slipped in anti-converter according to claim 4, it is characterized in that: the stove phenomenon that occurs slipping in described step S3 is undertaken by following steps:
S31: obtain the lever operated direction of grate;
S32: the change direction of obtaining converter inclining angle by the angle of converter inclining;
S33: judge that whether the lever operated direction of grate is consistent with the change direction of converter inclining angle, if so, do not occur slipping stove phenomenon;
S34: if not, occur slipping stove phenomenon.
6. the electric control method of stove is slipped in anti-converter according to claim 4, it is characterized in that: described converter inclining angle is obtained by turning angle encoder; The angular aceeleration of described converter inclining calculates by following formula:
a＝|θ
k+1-θ
k|，
Wherein, a represents the angular aceeleration of converter inclining, θ
krepresent the converter inclining angle of K during second, θ
k+1represent the converter inclining angle of k+1 during second, k is k moment second.
7. the electric control method of stove is slipped in anti-converter according to claim 4, it is characterized in that: in described step S4, make converter motor comprise the following steps in band-type brake state:
S41: time delay 1s-2s after frequency transformer sends zero-speed instruction;
S42: send instruction to mechanical hatching gate device, realize mechanical hatching gate.
8. the electric control method of stove is slipped in anti-converter according to claim 5, it is characterized in that: whether the change direction of the lever operated direction of described grate and converter inclining angle is consistent is undertaken by following steps:
S331: the turning angle value that keeps current converter;
S332: grate handle operates converter inclining, obtain the lever operated direction of grate and grate handle to converter inclining speed;
S333: be recorded in grate when lever operated, the conversion of converter inclining angle;
S334: if grate handle to flushing and casting, converter inclining angle should become greatly, if angle diminishes, direction is inconsistent;
S335: if grate handle operates after stove, converter inclining angle should diminish, if angle becomes greatly, direction is inconsistent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210295076.2A CN102776319B (en) | 2012-08-17 | 2012-08-17 | Electrical control system and method for preventing converter slippage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210295076.2A CN102776319B (en) | 2012-08-17 | 2012-08-17 | Electrical control system and method for preventing converter slippage |
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| Publication Number | Publication Date |
|---|---|
| CN102776319A CN102776319A (en) | 2012-11-14 |
| CN102776319B true CN102776319B (en) | 2014-03-26 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107641680A (en) * | 2017-10-27 | 2018-01-30 | 江苏永钢集团有限公司 | Converter body fascinates delay contracting control method |
| CN111624884B (en) * | 2020-06-03 | 2022-06-24 | 中冶南方工程技术有限公司 | Automatic slag discharge control method and system for converter slag car linkage |
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